Pub Date : 2010-05-23DOI: 10.1109/ICCW.2010.5503948
J. Márquez-Barja, C. Calafate, Juan-Carlos Cano, P. Manzoni
In the last decade wireless communications significantly improved, being widely used in various areas such as health, education, industry and research. Recently, the automobile industry is adopting wireless technologies in order to improve the services offered, such as safety, route planning and infotainment. In particular, Vehicular Ad-Hoc Networks (VANETs) are being promoted to improve safety and provide content delivery on the road. In this paper we provide a performance evaluation to assess the viability of a content delivery framework for VANETs. In our experiments we vary several parameters, such as vehicular density, vehicular speed, and content demand rate under different environment conditions. We evaluate, from a multi-layer perspective, the impact they have on metrics such as delivery latency, throughput, and packet loss; in particular, we evaluate user satisfaction through the latency perceived at the application layer, and the network performance via the packet loss. Results show that the overall performance is improved when speed and vehicular density are relatively high compared to typical urban traffic patterns.
{"title":"Multi-Layer Performance Evaluation of a Content Delivery Framework for Urban Vehicular Networks","authors":"J. Márquez-Barja, C. Calafate, Juan-Carlos Cano, P. Manzoni","doi":"10.1109/ICCW.2010.5503948","DOIUrl":"https://doi.org/10.1109/ICCW.2010.5503948","url":null,"abstract":"In the last decade wireless communications significantly improved, being widely used in various areas such as health, education, industry and research. Recently, the automobile industry is adopting wireless technologies in order to improve the services offered, such as safety, route planning and infotainment. In particular, Vehicular Ad-Hoc Networks (VANETs) are being promoted to improve safety and provide content delivery on the road. In this paper we provide a performance evaluation to assess the viability of a content delivery framework for VANETs. In our experiments we vary several parameters, such as vehicular density, vehicular speed, and content demand rate under different environment conditions. We evaluate, from a multi-layer perspective, the impact they have on metrics such as delivery latency, throughput, and packet loss; in particular, we evaluate user satisfaction through the latency perceived at the application layer, and the network performance via the packet loss. Results show that the overall performance is improved when speed and vehicular density are relatively high compared to typical urban traffic patterns.","PeriodicalId":422951,"journal":{"name":"2010 IEEE International Conference on Communications Workshops","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130103204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-05-23DOI: 10.1109/ICCW.2010.5503917
V. Li, F. Wu, J. Zhong
The existing power grid infrastructures in many countries are primarily based on technologies that have been developed as centralized systems in which power is generated at major power plants and distributed to consumers through transmission and distribution lines. In the recent decade, with the increasing penetration of renewable energy sources such as solar and wind power, and smart electrical appliances, the centralized model may no longer hold, and the supply and demand for electricity become more dynamic. Moreover, the latest developed information and communication technologies (ICT) and power electronic technologies could enhance the efficiency and performance of power system operations. Recently, concerns with global warming have prompted many countries to announce research programs on smart grid, which is the transformation of the traditional electric power grid into an energy-efficient and environmentally friendly grid by the integration of ICT, power electronic, storage and control technologies. With the smart grid, there is an opportunity for a new operating paradigm that recognizes the changing structures of the power grid with renewable generation, and the high-resolution data, high speed communications, and high performance computation available with the advanced information infrastructure. A new operating paradigm, namely, risk-limiting dispatch, is proposed for the smart grid in this paper. In addition, we have identified the requirements of a communication infrastructure to support this new operating paradigm.
{"title":"Communication Requirements for Risk-Limiting Dispatch in Smart Grid","authors":"V. Li, F. Wu, J. Zhong","doi":"10.1109/ICCW.2010.5503917","DOIUrl":"https://doi.org/10.1109/ICCW.2010.5503917","url":null,"abstract":"The existing power grid infrastructures in many countries are primarily based on technologies that have been developed as centralized systems in which power is generated at major power plants and distributed to consumers through transmission and distribution lines. In the recent decade, with the increasing penetration of renewable energy sources such as solar and wind power, and smart electrical appliances, the centralized model may no longer hold, and the supply and demand for electricity become more dynamic. Moreover, the latest developed information and communication technologies (ICT) and power electronic technologies could enhance the efficiency and performance of power system operations. Recently, concerns with global warming have prompted many countries to announce research programs on smart grid, which is the transformation of the traditional electric power grid into an energy-efficient and environmentally friendly grid by the integration of ICT, power electronic, storage and control technologies. With the smart grid, there is an opportunity for a new operating paradigm that recognizes the changing structures of the power grid with renewable generation, and the high-resolution data, high speed communications, and high performance computation available with the advanced information infrastructure. A new operating paradigm, namely, risk-limiting dispatch, is proposed for the smart grid in this paper. In addition, we have identified the requirements of a communication infrastructure to support this new operating paradigm.","PeriodicalId":422951,"journal":{"name":"2010 IEEE International Conference on Communications Workshops","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123172400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-05-23DOI: 10.1109/ICCW.2010.5503873
Zhaoxia Song, Zheng Zhou, X. Sun, Zhichao Qin
In cognitive radio networks, various cooperative spectrum sensing schemes are proposed to enhance the detection performance under noise uncertainty. The limit of control channel bandwidth will impact the sensing performance when the number of secondary users becomes very large. In this paper, a multiband cooperative spectrum sensing scheme is presented, which transfers sensing information utilizing the idle frequency bands rather than only depending on common control channel. According to the analysis and simulation results, the scheme of this paper can improve the system sensitivity and decrease sensing communication overhead of common control channel compared to traditional cooperative sensing scheme.
{"title":"Cooperative Spectrum Sensing for Multiband under Noise Uncertainty in Cognitive Radio Networks","authors":"Zhaoxia Song, Zheng Zhou, X. Sun, Zhichao Qin","doi":"10.1109/ICCW.2010.5503873","DOIUrl":"https://doi.org/10.1109/ICCW.2010.5503873","url":null,"abstract":"In cognitive radio networks, various cooperative spectrum sensing schemes are proposed to enhance the detection performance under noise uncertainty. The limit of control channel bandwidth will impact the sensing performance when the number of secondary users becomes very large. In this paper, a multiband cooperative spectrum sensing scheme is presented, which transfers sensing information utilizing the idle frequency bands rather than only depending on common control channel. According to the analysis and simulation results, the scheme of this paper can improve the system sensitivity and decrease sensing communication overhead of common control channel compared to traditional cooperative sensing scheme.","PeriodicalId":422951,"journal":{"name":"2010 IEEE International Conference on Communications Workshops","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132561753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-05-23DOI: 10.1109/ICCW.2010.5503943
B. Sardar, M. Nasipuri, Debashis Saha
Both the network mobility and the terminal mobility are likely to co-exist in the future. These two mobile communication paradigms have different wireless connectivity models and likely to deploy different schemes to address the wireless related performance issues for TCP. In this paper, we con-sider TCP Snoop, which allows a mobile terminal to efficiently recover from wireless-related losses. For the network mobil-ity, we consider on-board TCP (obTCP), which improves snooping performance when the mobile terminal is located inside a moving network. We investigate the performance of obTCP and Snoop when they operate over a common cellular base station. We evaluate their end-to-end throughput, and also their fairness in using cellular resources. Our study re-veals that obTCP achieves higher throughput than Snoop. We have further analyzed the results to show that the differences in the retransmission mechanisms of Snoop and obTCP are responsible for the higher throughput attained by obTCP. We have also observed that, obTCP does not bring any significant unfair to Snoop, allowing network mobility to co-exist with terminal mobility.
{"title":"Co-Existence of Network and Terminal Mobility in the Context of TCP Performance","authors":"B. Sardar, M. Nasipuri, Debashis Saha","doi":"10.1109/ICCW.2010.5503943","DOIUrl":"https://doi.org/10.1109/ICCW.2010.5503943","url":null,"abstract":"Both the network mobility and the terminal mobility are likely to co-exist in the future. These two mobile communication paradigms have different wireless connectivity models and likely to deploy different schemes to address the wireless related performance issues for TCP. In this paper, we con-sider TCP Snoop, which allows a mobile terminal to efficiently recover from wireless-related losses. For the network mobil-ity, we consider on-board TCP (obTCP), which improves snooping performance when the mobile terminal is located inside a moving network. We investigate the performance of obTCP and Snoop when they operate over a common cellular base station. We evaluate their end-to-end throughput, and also their fairness in using cellular resources. Our study re-veals that obTCP achieves higher throughput than Snoop. We have further analyzed the results to show that the differences in the retransmission mechanisms of Snoop and obTCP are responsible for the higher throughput attained by obTCP. We have also observed that, obTCP does not bring any significant unfair to Snoop, allowing network mobility to co-exist with terminal mobility.","PeriodicalId":422951,"journal":{"name":"2010 IEEE International Conference on Communications Workshops","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132128427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-05-23DOI: 10.1109/ICCW.2010.5503904
Arnaud Kaiser, N. Achir, K. Boussetta
In this work, we address the energy efficiency issue for time-sensitive multiplayers games in MANET environment. We propose a simple, yet efficient, client side packets concatenation solution, which exploit the information provided by a delay version of the OLSR routing protocol. Using gameplay objective metrics and extensive experimentations we show that our proposal can significantly increase the network life duration, while improving the game fairness among FPS (First Person Shooter) players.
{"title":"Improving Energy Efficiency and Gameplay Fairness for Time-Sensitive Multiplayers Games in MANET","authors":"Arnaud Kaiser, N. Achir, K. Boussetta","doi":"10.1109/ICCW.2010.5503904","DOIUrl":"https://doi.org/10.1109/ICCW.2010.5503904","url":null,"abstract":"In this work, we address the energy efficiency issue for time-sensitive multiplayers games in MANET environment. We propose a simple, yet efficient, client side packets concatenation solution, which exploit the information provided by a delay version of the OLSR routing protocol. Using gameplay objective metrics and extensive experimentations we show that our proposal can significantly increase the network life duration, while improving the game fairness among FPS (First Person Shooter) players.","PeriodicalId":422951,"journal":{"name":"2010 IEEE International Conference on Communications Workshops","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128626753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-05-23DOI: 10.1109/ICCW.2010.5503918
D. Dolezilek
While special protection systems (SPSs) often shed load, recent sophisticated remedial action schemes (RASs) reduce or terminate generation output during an emergency condition. Under certain load conditions, generation newly added to previously balanced transmission grids creates system conditions that violate accepted reliability criteria. At Southern California Edison (SCE), RAS systems are implemented to ensure reliable power system performance following outages on a transmission grid network. They include fast, automatic control actions to mitigate thermal overloads and system instability upon the loss of one or more transmission lines. With these automatic protection features, RAS systems are used in place of expensive alternative measures, which include reconductoring transmission lines, building new lines, and/or adding new transformers. Testing at SCE demonstrates the successful use of IEC 61850 GOOSE (Generic Object-Oriented Substation Event) messages over a distance up to 720 kilometers to collect analysis and arming data and transfer status and control indications. Complete detection, alarming, calculation, and remediation are completed in well under the 50-millisecond benchmark. Using standardized IEC 61850 GOOSE methods avoids the customization required to implement individual local RAS communications systems, allows centralized coordination of arming, disarming, and system testing, and simplifies the coordination of system maintenance. Reliability improves with capabilities to monitor end-to-end grid parameters and quickly respond to abnormal conditions. These methods of mitigation are intended to be used throughout the SCE area of operation as well as at all interties to neighboring utilities to facilitate dynamic load shedding/generation tripping and improved load management. SPSs and RASs must be put in place to protect existing systems that are called upon to serve new generation and load, are intertied with weak systems, or have geographical characteristics that reduce stability. Once protected, the automatic load and generation control ensures stability while improving production and reliability. Once these are in place, wide-area monitoring and control are safely added to replace state estimation with real-time state measurement and management.
{"title":"Case Study Examples of Interoperable Ethernet Communications within Distribution, Transmission, and Wide-Area Control Systems","authors":"D. Dolezilek","doi":"10.1109/ICCW.2010.5503918","DOIUrl":"https://doi.org/10.1109/ICCW.2010.5503918","url":null,"abstract":"While special protection systems (SPSs) often shed load, recent sophisticated remedial action schemes (RASs) reduce or terminate generation output during an emergency condition. Under certain load conditions, generation newly added to previously balanced transmission grids creates system conditions that violate accepted reliability criteria. At Southern California Edison (SCE), RAS systems are implemented to ensure reliable power system performance following outages on a transmission grid network. They include fast, automatic control actions to mitigate thermal overloads and system instability upon the loss of one or more transmission lines. With these automatic protection features, RAS systems are used in place of expensive alternative measures, which include reconductoring transmission lines, building new lines, and/or adding new transformers. Testing at SCE demonstrates the successful use of IEC 61850 GOOSE (Generic Object-Oriented Substation Event) messages over a distance up to 720 kilometers to collect analysis and arming data and transfer status and control indications. Complete detection, alarming, calculation, and remediation are completed in well under the 50-millisecond benchmark. Using standardized IEC 61850 GOOSE methods avoids the customization required to implement individual local RAS communications systems, allows centralized coordination of arming, disarming, and system testing, and simplifies the coordination of system maintenance. Reliability improves with capabilities to monitor end-to-end grid parameters and quickly respond to abnormal conditions. These methods of mitigation are intended to be used throughout the SCE area of operation as well as at all interties to neighboring utilities to facilitate dynamic load shedding/generation tripping and improved load management. SPSs and RASs must be put in place to protect existing systems that are called upon to serve new generation and load, are intertied with weak systems, or have geographical characteristics that reduce stability. Once protected, the automatic load and generation control ensures stability while improving production and reliability. Once these are in place, wide-area monitoring and control are safely added to replace state estimation with real-time state measurement and management.","PeriodicalId":422951,"journal":{"name":"2010 IEEE International Conference on Communications Workshops","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125036429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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